Days after the FBI named North Korea as the perpetrators of a massive hack on Sony Pictures, the isolated country is feeling the heat.

"When regimes warn of deadly reprisals against countries condemning their atrocities, as the North Koreans have done, that is precisely the moment when we need to stand up and not back down," U.S. Ambassador to the U.N. Samantha Power said.

The United Nations Security Council spent more than two hours debating North Korea's human rights record, denouncing the country for systemic violations of its citizens' basic rights. The unprecedented debate was part of an effort to refer North Korean leader Kim Jong-un to the International Criminal Court.

>> Read more trending stories

That movement isn't expected to go very far, thanks to the veto power of Pyongyang's allies, China and Russia. But North Korea might already be seeing another kind of blowback over the Sony hack.

According to Internet research firm Dyn Research, North Korea's limited Internet access was completely shut down Monday. The country's 1,024 IP addresses suffered serious instability and eventually complete loss of access for nine hours.

No group has credibly taken responsibility for the attack yet, but plenty of fingers are being pointed at the U.S., especially after President Obama threatened a "proportional response" to the Sony Pictures hack.

U.S. Department of State spokeswoman Marie Harf told reporters, "We are considering a range of options in response. ... Some may be seen, some may not be seen."

But a security researcher for Arbor Networks doesn't see signs of U.S. involvement in the outage. "Much like a real world strike from the U.S., you probably wouldn't know about it until it was too late. This is not the modus operandi of any government work."

If there is a nation-state involved, China could be a possible culprit. The U.S. government has been pressuring the longtime North Korean ally to take action against the nation.

It's also possible the attack, which resembles a basic DDOS strike, came from a non-nation group. Hacking organizations Anonymous and Lizard Squad have both posted messages threatening North Korea's Internet.

As of noon Tuesday local time, North Korea's Internet access had been restored.

This video includes images from Getty Images.